fn main() {
    // 整数相加
    println!("1+2={}", 1u32 + 2);

    // 整数相减
    println!("1-2={}", 1i32 - 2);

    // 短路求值的布尔逻辑
    println!("true AND false is {}", true && false);
    println!("true OR false is {}", true || false);
    println!("NOT true is {}", !true);

    // 使用下划线改善数字的可读性！
    println!("One million is written as {}", 1_000_000u32);
}
